Heat Advisory — Jefferson, IL, Wayne, IL, Edwards, IL, Wabash, IL, Perry, IL, Franklin, IL, Hamilton, IL, White, IL, Jackson, IL, Williamson, IL, Saline, IL, Gallatin, IL, Union, IL, Johnson, IL, Pope, IL, Hardin, IL, Alexander, IL, Pulaski, IL, Massac, IL, Gibson, IN, Pike, IN, Posey, IN, Vanderburgh, IN, Warrick, IN, Spencer, IN, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Crittenden, KY, Lyon, KY, Trigg, KY, Caldwell, KY, Union, KY, Webster, KY, Hopkins, KY, Christian, KY, Henderson, KY, Daviess, KY, McLean, KY, Muhlenberg, KY, Todd, KY, Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO 7:00 PM

McLean County, Kentucky, United States

Last updated: 4:59 AM CDT  ·  Refresh
22°C
Feels like 23°
Mostly Clear
▲ 36°  /  ▼ 20°
Wind
5 mph S
Humidity
70%
Dew Point
18°
Pressure
29.49 inHg
Visibility
10 mi
UV Index
0.0
Cloud Cover
14%
Sunrise
6:35 AM
Sunset
6:48 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: McLean County is currently mostly clear at 22°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 576 J/kg) — isolated convective development possible. Sunrise: 6:35AM · Sunset: 6:48PM.

Alerts

Heat Advisory
Jefferson, IL, Wayne, IL, Edwards, IL, Wabash, IL, Perry, IL, Franklin, IL, Hamilton, IL, White, IL, Jackson, IL, Williamson, IL, Saline, IL, Gallatin, IL, Union, IL, Johnson, IL, Pope, IL, Hardin, IL, Alexander, IL, Pulaski, IL, Massac, IL, Gibson, IN, Pike, IN, Posey, IN, Vanderburgh, IN, Warrick, IN, Spencer, IN, Fulton, KY, Hickman, KY, Carlisle, KY, Ballard, KY, McCracken, KY, Graves, KY, Livingston, KY, Marshall, KY, Calloway, KY, Crittenden, KY, Lyon, KY, Trigg, KY, Caldwell, KY, Union, KY, Webster, KY, Hopkins, KY, Christian, KY, Henderson, KY, Daviess, KY, McLean, KY, Muhlenberg, KY, Todd, KY, Perry, MO, Bollinger, MO, Cape Girardeau, MO, Wayne, MO, Carter, MO, Ripley, MO, Butler, MO, Stoddard, MO, Scott, MO, Mississippi, MO, New Madrid, MO
Expires 7:00 PM
61 AQI · Moderate Dominant: O3 Air Quality
Hourly Forecast · Next 24 Hours
Now
22°
3%
5 AM
21°
14%
6 AM
21°
14%
7 AM
23°
14%
8 AM
26°
14%
9 AM
29°
7%
10 AM
30°
7%
11 AM
31°
7%
12 PM
34°
3%
1 PM
34°
3%
2 PM
36°
3%
3 PM
36°
3%
4 PM
34°
5%
5 PM
33°
5%
6 PM
31°
5%
7 PM
30°
5%
8 PM
28°
8%
9 PM
27°
8%
10 PM
26°
13%
11 PM
25°
13%
12 AM
25°
8%
1 AM
24°
17%
2 AM
24°
8%
3 AM
23°
5%
7-Day Forecast
Today
36° 20°
Mostly Cloudy.
Mon
32° 18°
Partly Cloudy with a 50% chance of rain.
Tue
27° 15°
Overcast.
Wed
28° 12°
Mostly Cloudy.
Thu
28° 12°
Mostly Cloudy.
Fri
28° 13°
Mostly Cloudy.
Sat
26° 13°
Overcast.
TimeTempConditionsPrecipWindHumidity
Now 22° Mostly Clear 3% 5 mph S 70%
5 AM 21° Mostly Clear 14% 5 mph SSW 71%
6 AM 21° Clear 14% 6 mph SSW 76%
7 AM 23° Mostly Clear 14% 6 mph SW 70%
8 AM 26° Mostly Clear 14% 8 mph SW 59%
9 AM 29° Partly Cloudy 7% 8 mph SW 48%
10 AM 30° Overcast 7% 10 mph WSW 46%
11 AM 31° Overcast 7% 10 mph WSW 44%
12 PM 34° Overcast 3% 10 mph WSW 41%
1 PM 34° Overcast 3% 10 mph WSW 38%
2 PM 36° Overcast 3% 10 mph WSW 35%
3 PM 36° Overcast 3% 10 mph WSW 33%
4 PM 34° Mostly Cloudy 5% 9 mph WSW 32%
5 PM 33° Mostly Cloudy 5% 6 mph WSW 36%
6 PM 31° Partly Cloudy 5% 5 mph SW 39%
7 PM 30° Partly Cloudy 5% 5 mph SW 41%
8 PM 28° Mostly Cloudy 8% 5 mph SW 42%
9 PM 27° Mostly Cloudy 8% 5 mph SW 44%
10 PM 26° Mostly Cloudy 13% 4 mph SW 47%
11 PM 25° Mostly Cloudy 13% 4 mph WSW 51%
12 AM 25° Mostly Cloudy 8% 4 mph WSW 54%
1 AM 24° Mostly Cloudy 17% 4 mph WSW 63%
2 AM 24° Mostly Cloudy 8% 4 mph W 66%
3 AM 23° Mostly Cloudy 5% 4 mph WNW 70%
15-Day Forecast
Today
9/20
Mostly Cloudy
14%
20°
36°
Mon
9/21
Partly Cloudy
50%
18°
32°
Tue
9/22
Overcast
15%
15°
27°
Wed
9/23
Mostly Cloudy
7%
12°
28°
Thu
9/24
Mostly Cloudy
9%
12°
28°
Fri
9/25
Mostly Cloudy
13%
13°
28°
Sat
9/26
Overcast
14%
13°
26°
Sun
9/27
Partly Cloudy
5%
12°
29°
Mon
9/28
Clear
35%
13°
29°
Tue
9/29
Drizzle
51%
13°
30°
Wed
9/30
Drizzle
60%
14°
31°
Thu
10/1
Drizzle
60%
14°
29°
Fri
10/2
Drizzle
60%
14°
30°
Sat
10/3
Drizzle
60%
14°
29°
Sun
10/4
Clear
25%
14°
29°
61
Moderate
U.S. Air Quality Index · Dominant: O3
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
57 AQI 12.2 µg/m³
O3
Ground-level ozone
Dominant
61 AQI 58 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 61 Moderate 61 57
Mon 51 Moderate 40 51
Tue 46 Good 46 43
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Sun Sep 20, 08:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE0 J/kg
MLCAPE28 J/kg
MUCAPE5 J/kg
SBCIN—
MLCIN0 J/kg
Lifted Index1.6
Kinematics
0–6 km Shear20 kt
0–1 km Shear13 kt
Eff. Shear—
0–1 km SRH54
0–3 km SRH72
Eff. SRH—
Storm Motion317° @ 11 kt
0–1 km EHI0.0
Composite Parameters
Sig. Tornado0.0
STP (eff)—
Supercell—
K-Index23.8
Thermo & Levels
PWAT1.24 in
0–3 km LR4.5 °C/km
700–500 LR6.1 °C/km
Total Totals45.1
LCL936 hPa
LFC—
EL—
Freezing Lvl15,558 ft